Added ability to iterate through users in the database

src/user_management/manager.rs

@@ -83,6 +83,29 @@ impl UserManager {
         }
     }
 
+    /// Produce a list of all users in the database
+    ///
+    /// # Panics
+    /// An panics if there is an error reading from the database or if data recieved from
+    /// the database is corrupt
+    pub fn all_users<UserData>(
+        &self,
+    ) -> Vec<RegisteredUser<UserData>>
+    where
+        UserData: Serialize + DeserializeOwned
+    {
+        self.users.iter()
+            .map(|result| {
+                let (username, bytes) = result.expect("Failed to connect to database");
+                let inner: PartialUser<UserData> = bincode::deserialize_from(bytes.as_ref())
+                    .expect("Received malformed data from database");
+                let username = String::from_utf8(username.to_vec())
+                    .expect("Malformed username in database");
+                RegisteredUser::new(username, None, self.clone(), inner)
+            })
+            .collect()
+    }
+
     /// Attempt to determine the user who sent a request based on the certificate.
     ///
     /// # Errors